Added an MF_SHOW_PAGENUMBERS flag to Menu, which will show "(page X of Y)"

as part of the title. This can get a bit confusing when scrolling using up and down (as opposed to page-up/page-down.) Currently only used for select_items().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3047 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 11, 2007
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